hazelton



C. H. HAZELTON.

ELECTRODE ADAPTER.

APPLICAHON HLED szPr, 9, 1918.

1 330,532. Patented Feb. 10,1920.

INVENTOR. C, H. HAZELIDN BY J M/W.

A TTORNEY UNITED STATES PATENT OFFICE.

CHARLES H. HAZELTON. 0F LAKEWOOD, OHIO. ASSIGNOR TO NATIONAL CARBONCOMPANY. INC, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed September 9. 1918. Serial No. 253.182.

'1 '0 all u'lmm it may com-em Be it known that 1. CHARLES H. ll-AzsL-Tox, a citizen of the United States, .residillg at Lakewood, in thecounty of Cuyahoga and State of Ohio, have invented a certain new anduseful Improvement in Electrode- Adaptcrs, of which the following is afull, clear, and exact description. This invention relates to adaptersor holders for electrodes of electric arc lamps. The improvement isparticularly applicable to projection apparatus for motion pictures.

It is customary for this service to use pro jection apparatus which issuited for various conditions. For instance, the machinesusually areadapted for either alternating or direct current. \Vith alternatingcurrent the positive and'negiitivcelectrodes preferably are the-samesize, but with direct. current 1- negativenfconsiderahly smallerdiameter than the positive is used In either case prior holders areadapted to hare-huslrinfls fitted therin to take \"arious sizes ofelecnodes; With-this type of Troiector adapted between them isaboaffive'inches. Conscfeeding mechanism only permits the the electrodeholders toapplmich-each other until the distance for variousi kit'ids" -ofservlce,

quently-ati least-a two and onehalf; inch stub of each-olectl'mle musthe thrown With 'diriicficurrent projector arc inn 9 using a small metalcoated negative, it 'Oli' (l he permissible to burn the electrode to amuch sllfll'ltl stuh usthc uriflame is directed a\\':| from the holderof the. negative. and my invention relates to an adapter for thenegative electrode which will permit thiwithout changing the lumpadjustment.

'llu- -lrlurturiof the adapter will he set forth in the followingdescription and illustrated hy the dmwings in which:

Figure l is a longitudinal cross section of the adapter with a short.electrode stuh clumped therein.

Fig. 2 is a side view.

Fig. 3 is a plan view.

Figs. 4 and 5 are end views from the right Iand left hand sidesrespmtively of Fl igs 5 and 7 ii're pseudo perspective views of adetail, the former being upright and the latter invert/ed.

The, body of the adapter preferably IS made from a copper castingbecause the copper in addition to being a good electrical conductor alsowithstands the heat and the corrosive influences within the arc chamber.'lhe major portion of the length of the casting is in the form of a tube1 0f shch diameter that the end may bereadily fastened in the negativeelectr tion apparatus in lace of the electrode or the bushing which sordinarily fitted therein. The inner diameter of the tube is only 'lessthan the outer diaineter that sizes of negative electrodes in ay Theclamping end head 2 intehole 10. a hole 11 pl'qvl block 8. nult 1'3 isltitted in threaded i \'l( u wit l :1 projection 14 In tcr than thethreaded abuts against thc top of hlockl-i and t re projection fits inhole 11.. The block is fastents] to the end of .thc rodfby barring orriveting the end. which operation is conveniently uccom Iishcd bypassing the riveting tool throug l the lower hole 5 provided for thispurpose:- The adiustahle block is thus permunentl fastened to theclamping screw in an inexpensive, durable manner.

e holder of the projec- "Zide's'ttor a small iiferrthe e c n the upper'pdrtiq'n 6 'anil' l g helo'w thif n clamping A u n-idol m t' ls paringa wing I i hol ejilfl and prqller'diain and no machining of any of theparts is necessary.

When a new electrode wt in the machine it will pass through -t etnhe andhe clamped in the desired osition by turning the s rew 12 until the ccf'trode is clamped between the block 8 and the bottom of the head. Theuse of a special bushing for various sizes of negative is thereforeelimi-- noted and the adapter thus saves the expense and inconvenienceof providing bushings. As the electrode is consumed it is moved forwardin the clamp and may he used until the stub is only 5 inch to 1 inchlong, as

up. 5 2 shoulder at the end of tho't readed oi'tio'n shown in Fig. 1' ofthe drawings. The length 'of the electrode saved is about the same asthe length of the adapter.

An improved result obtained by the use 5 of the ved clamping surfaces isthe elimination of breakage. The electrode is clamped along severallongitudinal lines or surfaces instead of at a single point.

In projection apparatus t e positive electrode is of large which makesit impractical to burn it very short, and in alternating current lampsit is impractical to burn the electrodes to very short stubs, but obiously" my improvement need not be limited to use with negativeelectrode. Q

Having described my invention, what I clain. is: I i

1..In adapters for arclainp electrodes, a metal, tube adapted to beclamped at one end in Lar electrode holder to electrically connect thetube with the holder, said tubehavmg a gassa'ge therethrough for an.electrode, a

lock movably mounted in the other end of the tube and a. setserevvpassing'tlir'ough' and having a'pairof holes therein opposite thetube and engaging; the blocle/- 2. Iniadapters for are lampelectrodes,;a metal tube adaptedto be clahlpediat'on end so inani'electrode holder to-electricallgconaect the tithevwit'hjthe;1111114161 said tubehavmg a passage tl'iereth:ron'gh- (infillelectrode. a' gu de attached to thentherend of'the tube,

a 'blo'cfi 'mmfablyifnmuntediin the s5- ide i m origitgingthhloclh-jdiameter and-emits a flame can be used for such purposes if desired, and

' electrode holder and having a passage therea set-scrcvv the.signature.

3. In adapters for are lamp electrodes, a tube adapted to be clamped atone end in an electrode holder and having a passage therethrough for anelectrode, an enlarged 40- guidc head integral yith the tube at theother end of the tube and having a hole, a clamping block movablymounted in the vuide head, and a set screw passing throu h the hole andengaging the clam mg bloc .4. In adapters .for are lamp e ectrodes, atube adapted to be clamped at one end in an electrode holder and havinga passage thercthrough for an electrode, an enlarged guide head integralwith the tube at the other end of the tube and having a threaded holeand a grooved bottom opposite said hole, a clamping block movablymounted in the guide headand adapted to cooperate with the groovedbottom to hold an electrode, and a set screw fitted in thehole and engaing the clamping block.

'5. n adapters for are lamp electrodes, a tube adapted to be clamped atoneend in an through-for an electrode, an enlarged guide head integralwith the, tube at the other end to each other, a rooved clam ing blockslid-. cad, and a sages screw fitted in one in itheguide head and havingone end fitted in the clamping block and riveted at a point opposite theother liole in the uide headr V a .In testimony w ereof I hereunto affixniy 7o 7 CHAS. H. HAZELTON.

